According to this tutorial by Simmington >> http://simmington.tumblr.com/post/134302775218/my-mods-folder-is-123-gb-and-used-to-take-10-15

You need to remove spaces and special characters on CC name, for example name_1.package into name1.package

This is the list of special characters if you dont know :

 é ”, ; . : ~ ! > £ ’ < ^ # $ + % ½ & { / [ (  _ * ? \ - ] ) } € @ æ ß ü ğ ı ç ö ¨

If you have tons of CC, you can bulk naming & delete special characters in your CC using this software, its safe. you can find the explanation about how to use this way on this post by icecreamforbreakfast >> http://ice-creamforbreakfast.tumblr.com/post/134752071165/renaming-your-cc-for-a-faster-game